Rotating Infrared Thermography for Panoramic Temperature Uniformity
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Solution Overview
Problem
Infrared cameras used for thermography suffer from non-uniformity and instability in image correction due to non-compensated parasitic flux, leading to spatial non-uniformities and limited field of view.
Innovation Solution
An infrared thermographic system with a rotating image sensor and a near-field infrared reference source for non-uniformity correction, combined with a processing module for pixel-to-pixel subtraction and temperature calibration, and an optional visible light sensor for simultaneous imaging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If an internal shutter is used to correct image non-uniformity, then gain stability is improved, but spatial non-uniformities increase due to uncompensated parasitic flux
Solution Approach 1:
A separate reference sensor is introduced as an intermediary element to measure parasitic flux independently. This reference sensor captures the parasitic flux signal, which is then used to correct the main image sensor's measurements, thereby eliminating spatial non-uniformities without compromising gain stability achieved through the internal shutter.
Solution Approach 2:
The system implements feedback by continuously measuring parasitic flux through the reference sensor and using this information to correct the image sensor's output. The parasitic flux measurement serves as feedback that compensates for the non-uniformity introduced by the internal shutter, creating a closed-loop correction system.
2Device complexity
If a fixed field of view is used in infrared cameras, then device complexity is reduced, but measurement coverage is limited
Solution Approach 1:
The field of view is segmented into multiple regions by using an array of image sensors positioned at different orientations. Each sensor captures a specific portion of the scene, and the results are combined to create a comprehensive panoramic view, thereby expanding coverage without requiring a single complex sensor system.
Solution Approach 2:
The reference sensor serves multiple functions: it measures parasitic flux for correction, provides calibration information, and can independently capture images. This multi-functionality reduces the need for separate dedicated components, maintaining system simplicity while enhancing capabilities.
3Area of stationary object
If an array of image sensors is used to expand field of view, then measurement coverage is improved, but device complexity increases
Solution Approach 1:
Multiple image sensors are merged into a unified system where their outputs are combined to form a comprehensive panoramic image. The reference sensor is integrated with the image sensor array, sharing processing resources and correction algorithms, thereby reducing overall system complexity despite the increased number of sensors.
Solution Approach 2:
The system dynamically adjusts processing parameters based on the specific sensor being read and its spatial orientation. By adapting correction factors and processing algorithms according to each sensor's characteristics and position, the system manages complexity through intelligent parameter management rather than hardware complexity reduction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves improved stability, uniformity, and expanded field of view, enabling accurate temperature measurement and real-time detection of objects with enhanced accuracy and reliability.
Implementation Method 1
an image sensor (preferably of thermal infrared images) arranged to collect radiation (preferably infrared) and construct at least one image based on this radiation
Implementation Method 2
the processing module being arranged and/or programmed to correct a spatial non-uniformity of the acquired images as a function of the non-uniformity correction source
Implementation Method 3
an infrared reference source, called calibration source, that is thermostatically controlled or equipped with means for measuring its temperature
Data Source
AI summary
An infrared thermographic system configured to detect the temperature of an object including an infrared thermal imaging sensor arranged to collect infrared radiation and construct at least one image from the radiation and a drive support unit arranged to rotate the sensor around an axis of rotation is provided. The imaging sensor is attached to the drive support unit such that upon rotation of the drive support unit, the imaging sensor captures separate areas surrounding the thermographic system. The imaging sensor is arranged to acquire a plurality of separate images such that the combination of the different images forms a continuous panorama of at least 180 degrees about the axis of rotation of the drive support unit. A processing module arranged and/or programmed to determine temperature data of the object from the images acquired by the imaging sensor is also provided.